Pulverizing-mill.



13.0.BRADLBYi PULVERIZING MILL. APPLIUATION FILED MAR. 18, 1912.

1 1 1 4;, 1 O3. Patented 001;. 20, 1914.

2 SHEBTS*SEEET 1.

/y'a/miiz L'. radley.

THE MORRIS PETERS CO.. PHOTO-LITHC, WASHINGTON, D. L..

B. C. BRADLEY.

PULVBRIZING MILL.

APPLICATION FILED MAR.18, 1912. 1,1 14, 103.

Patented 0013.20, 1914.

2 SHEETS-SHEET 2. l

Q5 @MIM @Homey THE NoRRls PETERS Co.,PHOT0LlTH-1, WASHINGTON. D. C.

BENJAMIN o. BRADLEY, oE CANTON, oriio. i

rULvERIzING-MILL.

` Specification of Letters Patent. i i' Paiggntd 001;, 20,1914,

Application filed March 18, 1912. l Serial No. 684,409.

To all whom it may concern:

13e it known that 1, BENJAMIN C. BRAD- LEY, a citizen of the UnitedStates, residing at Canton, in the county of Stark and State of Ofhio,have invented certain new and useful improvements in Pulverizing-Mills,of

which the following is a specification.

My invention relates to improvements in pulverizing mills, especiallydesigned for pulverizing cement and like material.

r1`he objects of the present invention are, first, to so arrange thevarious parts ofthe mill that the movable parts or more specifically theparts designed to pulverize the material will not become crystallized byeX cessive jarring, and second, to so arrange the various parts of themill proper thatl complete pulverization is effected.` These objectstogether with other objects readily apparent to those skilled in the artI attain` by the construction illustrated in the accompanying drawings,although my invention may be embodied in various mechanical forms, theconstruction illustrated being deemed preferable to carry out theobjects and purposes of my invention.

In the accompanying drawings-Figure 1 is a side elevation showingpartsbroken away. Fig. 2 is a transverse section of one wing or portionof the carrier showing the pusher properly connected. Fig; 3 isadetached view of one of the grinding `ball drivers or pushers. Fig. 4 isa detached view of the ball remover. Fig. 5 yis an end elevation showinga part of the grinding chamber plate or cover broken away. Fig. 6 is avertical section on line-H-, Fig. 1. Fig. 7 is a sectional view showingthe lower end of the feed spout.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings. i In the accompanying drawings 1 represents thepower shaft which is j ournaled in suitable bearings 2, one bearingbeing located upon each of the supports 3 which supports are formed of aproper height and secured together in any convenient and well knownmanner. The supports 3 are of ordinary construction and are located upona Upon the` suitable foundation or base. power shaft 1 is located andsecurely fixed the power lwheel or pulley 4, which power wheel or pulleyis driven from any source of power. Upon the power shaft 1 is se-`curely mounted the carrier 5, to whichcari'ier arci pivotally `connectedthe grinding ball -drivers or pushers 6, which pushers are .providedwith the arms 7, which arms are V connected to the carrier as bestillustrated in Fig. 2. j i.

For the purpose of providing means for inserting-and removing the balldrivers or pushers 6 and their parts and the grinding balls 8, thecarrier 5 is provided with the removable plate 9 when said plate isremoved the balls 8, together with the drivers or pushers 6 canbe movedoutward withlout disturbing the positionl of the carrier 5.

For the purposeof pivotallyconnecting the I'ball pushers or drivers 6with the carrier 5, zthe cross-bolts 10 are provided, which crossboltsare located through the flanges 11 formed integral with the carrier andthe detachable s. plate 9, `said bolts passing .through suitableapertures formed in the ifiangesll, the plate9 and the arms 7. `Aroundthe carrier 5 and concentric `there- `with is located the grinding ring12, which ,grinding ring issecured in position with grefeience to the`fixed casing or housing 13. lTlie grinding ringz 12 is provided withthe ball race or groove 14, which race or groove is f or the purpose ofreceiving the material ,designed to `be rground or pulverized The jgrinding surface ofthe groove 14 is curved i fin cross section, thecurvature correspond'-y ing substantially with the spherical ;curva-{ture of the grinding balls 8.` It wllbe understood. that as thegrinding balls ,8

,come in Contact `with the grinding surface lof the. groove 14 in thegrinding ring 12,

they will travel lover and upon the material in said groove 14.

"For the purpose of` allowing the ball` drivers or pushers `6 to` move`backward the springs 15 are provided which springs are located againstthe `backs of the ball drivers or pushers 6 and the flanges orspringseats `lformed'upon the carrier 5. In use I prefer to formthe flanges orspring seats 16 in* tegral with the carrier 5, but yif desired saidflanges or spring seats may be formed separate and attached in anyconvenient and well known manner.

It will` be understood that by pivotally attaching the pushers` 6 `atpoints spaced from the aXis of the carrier andsaid pivotalpoints beingat the rear of the grinding balls 8 the pivotal movement `of the pusherswill be in substantialfuniso'n at the `slight backward movement of thegrinding balls, thepushers i iio 6 being held in contact with the rearsurfaces .balls coming in contact with the larger particles of materiallocated in the path of the balls. By thus cushioning the balls andremoving the sudden arring action the cause of crystallization toadjacent parts is to a great extent removed, owing `to the fact thatthere is a yielding movement as between the grinding ball and thecarrier.

For the purpose of providing means for conveying ymaterial to bepulverized to the machine proper la hopper 17 is provided, which hopperis provided with the gate 18, which gateis of the usual construction.Below and at one side of the hopper is located the feed screw 19,whichfeed screw is located upon the shaft 20, which shaft is providedwith the stepped pulley 21. Below the chamber of the feed screw 19 islocated the feed trough or spout 22, which feed trough or spout extendsdownward and its bottom or lower end or portion is curved as illustratedin Figs. 5 and 7, said lower end or portion being curved for the purposehereinafter described. The lower portion of the feed trough or spout22is provided with a suitable opening so as to allow material to passfrom said feed trough into the grinding chamber. As the material passesdown the feed spout'22 it is delivered upon the grinding ring 12', .andfor'the purpose of assisting in conveying the material into the groove14 formed in the grinding'ring 12 the ball drivers or pushers 6 areprovided with the inclined curved flanges 23, said flanges being vlocated in such a position that they will come in close proximity withthe inner surface of the grinding ring and upon opposite sides of thegroove 14 by which arrangement the material is moved inward and into thegroove 14 formed in the grinding ring 12.

with the grinding chamber.

the'pulleys 30 and 31 in connection with an ordinary belt.

Within the fan chamber 25 are located the kscreens 32 and 33 whichscreens are properly inclosed by a suitable casing 34. The inner screen33 is relatively coarse as compared with the outer screen 32, the outerscreen being of such a mesh that no material except that brought to thedesired fineness is to pass; but if material should pass into the fanchamber 25, which has not been properly reduced or brought to the properdegree of fineness but of sufficient fineness to pass through the innerscreen it will be returned to the grinding mechanism by means of theinclined bottom 35, the material not passing through the inner screenwill be discharged through the openings 3G formed in the plate 37 andthence to the inclined bottom For the purpose of creating a suctionthrough the grinding mechanism and from the feed spout the defiectingblades 24 are inclined and the fan blades 27 also inclined, the forwardends of said blades 24 and 27 are curved whereby the suction isincreased, but the same object can be accomplished without the specificcurvature shown.

It will be understood that by reason of the blades 24 and 27 beinginclined and by reason of the curvature of the bottom or lower end ofthe feed spout 22 a suction will vbe produced, the air being taken in tothe grinding chamber and fan chambers from the bottom or lower end ofthe feed spout, which bottom or lower end communicates The purpose ofcreating the suction or more specifically taking the air from the feedspoilt is to prevent the dust or finer particles of material fromfinding its way into the room or place where the machine may be located.

It will be understood that in order to ereate this suction the rotationof the carrier 5 must be in the direction indicated by the arrow Fig. 6.For the purpose of protecting thepower shaft 1 and at the same timedividing the blast or current of air the shield 38 is provided, the topportion of said shield being convexo-concave and its lower portion orthe part 39 inclined downward and under the power shaft 1. As the fanblades 27 are rotated the greater portion of the air will be driven orforced under the shield and pass between said shield and the plate 37thereby creating a lifting suction from the chamber located below theplate 37.

It will be understood that all material brought to the proper degree offineness to pass through the outer screen 32 will be conveyed to thedelivery spout 40. The fan shaft 28 is provided with a pulley 41, whichpulley is for the purpose of driving the pulley 42 mounted upon thecounter shaft 43 by means of the belt 44. Upon the counter` shaft 43y islocated the stepped pulley 45,

ita

which stepped pulley is for the purpose of driving the stepped pulley 21mounted upon the shaft 20. By providing the stepped pulleys 21 and 45the speed of the shaft 20, together with the conveyer blade 19 can bevaried thereby regulating the feed of the material to the mill proper.The gearing here illustrated to rotate the shaft 20is shownconventionally and it willbe understood that any method of gearing maybe employed without departing from the nature of my invention.

It is well understood that the grinding balls 8 and the pushers orcarriers Glare of considerable weight and by reason of the rapid wearingaway of the grinding balls it is necesary `to remove the worn balls andsubstitute new ones at frequent intervals and in order to do so withconvenience I provide a trough shaped plate 46, which may be placed inthe position illustrated in Fig. 5.

For the purpose of retaining the balls in proper relative position withreference to the pushers 6, said pushers are provided with the forwardlyextended fianges 47.

F or the purpose of holding the springs l5 in their seats the pushers 6are provided with the pins 48, which pins are preferably formed integralwith the pushers 6, but of such a length that they will not interferewith the actions of the springs.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent, is-

l. In a pulverizing mill, the combination of a shaft, a carrier mountedupon said shaft, said carrier provided with grinding balls, a grindingring, a fan chamber located at one side of the grinding mechanism, saidfan chamber inclosed by screens of different mesh, a fan located withinthe chamber and means for actuating the fan, a

shield located below the fan and provided with a downwardly inclinedportion, said downwardly inclined portion extended below the carriershaft, substantiallyT as and for the purpose specified.

2. In a pulverizing mill the combination of a shaft, a carrier mountedupon said shaft, grinding elements carried by the carrier and a fixedgrinding ring, a fan chamber located at one Vside of the carrier, saidfan chamber inclosed by screensof different mesh, a curved plate locatedbelow the fan and between the lowerspaced ends of the screen having thelarger mesh, said plate provided with openings and one end of said platespaced from the screen having the larger mesh, substantially as and forthe purpose specified.

3. In a pulverizing mill thecombinatiou of a shaft, a carrier mountedupon said shaft, grinding elements carried by the carrier and a fixedgrinding ring, a fan chamber locatedat yone side of the carrier,` saidfan chamber inclosed by screens of different mesh, a curved platelocated below `the fan and between the lower spaced ends of the screenhaving the larger mesh, said `plate provided with openings and one endofsaid` plate "spaced from' the vscreen having the,` larger mesh, and ashield located between` the fan and said plate, substantially as and forthe purpose specified.

4; In a pulverizing mill, the combination of a shaft, a carrier mountedupon said shaft, grinding elements carried by the carrier and a fixedgrinding ring, afan chamber located at `one side of the carrier, saidfan chamber inclosed by screens of different mesh, a curvedplate located`below the fan and between the lower spaced ends of the screen havingthe larger mesh, said plate provided with openings, and one end of saidplate spaced from the screen having the larger mesh anda shield locatedbetween the fan and said plate, said shield located within the fanchamber, substantially as described. y i

'5. In a pulverizing mill, the combination of a shaft, a carrier mountedupon said shaft, said carrier provided with grinding elements, pushersprovided `with `spaced arms, one of said arms pivotally connected to thecarrier and the other arm pivotally connected to a plate detachablyconnected to the carrier, said pushers adapted for contact with the rearsurfaces ofthe grinding elei,

ments, a fixed grinding ring located coneentric with the carrier, a fanchamber located `loto at one side of the carrier provided with thegrinding elements, a feed spout curved at its bottom or lower end andprovided with an opening leading into the `grinding chamber,substantially` as and for the *purpose specified.

6. 'In a pulverizing mill, the combination `of a shaft, acarrier'mounted upon said shaft, said carrier provided lwith grindingelements, pushers provided with spaced arms, one of said arms pivotallyconnected to the carrier and the other arm pivotally `connected to aplate detachably connected to the carrier, said pushers adapted forcontact "with the rear surfaces of the grinding elethe grinding elementsand pushers, substan-` V tially as and for the purposesspecied. y

7. In a pulverizing mill of the class described, the combination of ashaft, a car rier mounted upon said shaft, said carrier provided withgrinding elements and a fixed grinding ring, a fan chamber located atone iso side of the ygrinding elements, a fan shaft and fans mountedupon said shaft, said Jfans locatedy Within the Chamber, said fan bladesinclined atan angle to a line parallel with the fanshaft, and deiiectingplateslocated i upon the carrier and inclined to correspond with theinclination of the fan blades, substantially as and for the purposespecified. ,l 8. In a pulverizing mill of the class described, thecombination of a shaft, a carrier mounted upon said shaft, said carrierprovided with grinding elements and a .Fixed grinding ring, a fanchamber located at one side of the grinding elements, a fan shaft andfans mounted upon said shaft,

said fans located within the chamber, said fan blades inclined at anangle to a line parallel with the fan shaft, and deflecting plateslocated upon the carrier and inclined to correspond With the inclinationof the fan 20 blades, and a feed spout provided with a lower curved end,substantially as und for the purpose specified.

In testimony that I claim the above, I

have hereunto subscribed my naine in the 25 Copies of vthis patent maybe obtained for five cents each, by addressing the Commissioner ofPatents,

Washington, I). C.

